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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e3466ea4386be03de0fff409bd6321bbb152125a2ffa541cce69cc7de93a88' 
  AND token = 'Fd8y2JTNGqvtT5t60E8gEnpqzrJaCTp4UbLdapTvoAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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