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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca3de1fdbd3cce3bd4e28ff023a67f87cca186c9bbd5b80a401f7ea470fb9e0' 
  AND token = 'KR3fyLARy8QJgUThvtrFK+6Mf76JDiQwi1bGqRvNeYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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