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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedb476c14af349931640c5bf7e8e6e06095067b4626f9f65b3e2da61955eec8' 
  AND token = 'tj1P080c5QMc+r0rN7+0ETPF+c2Rwd20mBedG/aVF8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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