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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bddca9f4eb340ba415e91b174bb8c834dabcc92734972ea29b4ef6efddb3812a' 
  AND token = '3a4oJSOPpU4ktCY4rMcAbe8bj+vBZvOStG2cHPn5MGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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