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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77ee08b14706f5aa90ca88613bbe700612ac4449f92ae55f7afd61a1bd42e8c' 
  AND token = 'UxTYtXfacifvwUPEFud2aVg9Gd2lXCZ3Vt0sF1E2Ais=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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