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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b59e06c00af0e8e44f08e204120c258c47446b0ba83ec72cd1718bd0838c9b8' 
  AND token = 'MNsc24u6Cr111SElaLAHuTdMzCJoZ7yxyjWxSetHr4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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