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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ef19ec6795a462f86c1e76c1159e5fc46a66482b12c8928812f80c1dc43fb1' 
  AND token = 'FykSuio3L+R3Ln8jiE00YYU/r26ViUuleKK4h6/ow9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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