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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611dbe1331dd545be97fa9a979ae29ade6d21c236dd46091b61895508476c987' 
  AND token = 'vEvxlgkCET7Rqz4oXoYwP8foHVHRabeJJTSw/Id+Dok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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