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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995ccb77d6c0a639f8ffcdb7a24a251c2352a00a3d1b6f86193d2d4637337e35' 
  AND token = 'pj+RZ6rSKaI4RlF7N9+/vNU3Xlr/g7DD6akaYkBfFGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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