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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e25df260f6f2c19e9e065b5a201856e22f81257d9dd6401b1db57f6d0466fe9' 
  AND token = 'zIZfMSs8dpkDYdDB+BVzOPZWKzAehW7HOcAlmvgyxYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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