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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fe01045c9a2ff3ce4106895be025ee91787f8b04c6921f2c8128437d922e7a' 
  AND token = 'suDuyrh9r0FAwVIMG8LoHXD3J+XQ0tCEBRKjO2We/4I=' 
  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"
    }
  }
}