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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82d10fe8a82ee36d61a4281dc28a9fb662a665b0488bb06e2c3f70b7feae86a' 
  AND token = 'ZL+HQU5gOFHviNMCAgvMDniZBShBEjPWzLNdN+uxBiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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