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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ba25b100cef501c91c0dd3290b704576b8b5e7597552de043801845f7720bd' 
  AND token = 'gwTCOft/l+cpzAEjKTPJIEAhE1c6IgkQjdjqtJoag3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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