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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8322b788ae0e8c24927b1a5a5b48651f701b9b7a39ed401c5282fdafde46425' 
  AND token = '9cgxlsJv14GNuFiXem9nECq5s69NfjJi35E3328CvGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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