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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcca27a0c628a09b308e13223a651378a1f3ae40cddfccd483dc6b9986368e1' 
  AND token = 'HQuShmmsu5Usc/SF3j7NiO5fnkzdye/d+Ekt4SsnRWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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