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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd933d6bb2c9d0f6526891109ff3bb875658be315e7aac76d7dec55de1dc5b8ad' 
  AND token = '0HxYAUxZRRyGTYHL/rrdSKa2HeHrYN4EJuS8fx0vpKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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