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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7895698e1e9a0df1734b3440ead85d74c37a37ea82a78823ca310403eab85248' 
  AND token = 'uE8vCPr8JQd/ZQdxlnRTNLinnkFvbOShldgaE7GZ4qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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