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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96cd76c7a0e2639066d164009a58d0a49e35354cdd0ca8c5ba77360819ec3a2' 
  AND token = 'kk1Inds+525JVHJJqX96YwVhl5VpTxip68AiiwEh/DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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