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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345635871595d25cc7e4abd8fa0635987102d6bdf5da668410403029b40b026a' 
  AND token = '3BTqdyiv8OAQVR6cHFmtkSD4lzCdFszSTFNJNMqXAO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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