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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca3ee95c0021259627b10c584d6dc837cccab320f72edb4c8b80901f179ae20' 
  AND token = '5f2Ex8muoBG3jaDeQCHbFGsfpFwLZtOii01iV2QlYxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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