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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f088beef1b15176a33533388ee1b761b583e5b7e2042125dddc418d0365ead4d' 
  AND token = 'hCtuuuRESI9ZfcUAe+lJ9yaf8Q72wQ5b6gx2Mu0efYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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