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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d708ee67d7342a27086917bb00980578d90f3eeacf85b33d8a6091c11eb95a' 
  AND token = 'UjRiljI/n00zURuMTg8S0WGjE1h/vCrU94ha9AAsKOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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