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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a879d56c9bda658b4fa6e6c6f2ec7ec00f361c68793484c4212ff8b8a93e9d0b' 
  AND token = 'BNzl5qJy8FV7GrAPafLVe84lx/NfYnBJOauSa6UvMhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}