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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142b736988e8406b0d344df4aad0e4ba1cd3a49a78ed3c01cd5589f75d9f990c' 
  AND token = 'SdMLjB2apcX+xM2SSGJTr43Sau4ibQ/PPMm0qnd7KXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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