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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2e6e5d8183791db139a0ae1859bafda11e9e6870e6ce37cf09472eaa074e26' 
  AND token = 'f8knVYGNr8FQX4pHiGrpG6U0R+NBWH5WlnDh68WI6y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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