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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b592a3a018f7ca92b830f53f62c285ff9bdcadef71f6cf4ea757c2b8a7bf6062' 
  AND token = '/0LrH9v6ysBLPxkaDRX2yYDV+MOd7Xtxo/q4fCu7fHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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