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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4e23a97fa8848c435c5dafe1293546020ae993256ff9c6768999be5d408abb' 
  AND token = 'jxfD9BCm0tXMam2bpbXpp3FTLQwokEqGQfT72fB/s78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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