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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c722d937eec165c58854226eb72c8b06d230bcd200cbd0d31133aa1b626e8d9e' 
  AND token = 'm8TA7AxXm4ZN7p1bEJKutzS9v9mNQCbq7riOwz9HXm8=' 
  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"
    }
  }
}