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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa2ff2dfcb9a890db893aa656685be1b2be94323aa8ffb83657a4b783f11aea' 
  AND token = 'k2k/YdT0uPXdGAP1DUgl4BLIhIp1Xzr1EKjt4RVaf/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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