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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ae0880722720586158dd0d172f0c4e9b8f11abb7ab013bd41ea8c6e89cc587' 
  AND token = '42UgVIn9teD45zB7X1ksdS5iB8d6huADLDuwe/27G3g=' 
  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"
    }
  }
}