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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4f888a7415ffed5b1e53e2cc9ede3be3c0f3a86766fc3fcff81f69c890fb5b' 
  AND token = 'E/I4gu/VQ5O34G+nIDqjNYFlAjuTsQWgIl0n2EPm2lE=' 
  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"
    }
  }
}