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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34224d4e3ed6cf6d586b6e577d29e56321ac354d77286e5d255c4226649169e3' 
  AND token = 'Jk3CsSFBryqnlfTdxkWW4ZrnOLy228fP7bex8MUzBCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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