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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f06b49a4c018abf701208bfb7e8fe2a6f52744ca5cac92c74a3118f52af905' 
  AND token = 'YQLLAXqTsPLEjA4fXvpF7iWoxprmiRwvW8tsPu+G1Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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