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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19b36014dd9f990f9dc326a3b4164f9ac95946ee9260664b3741111a8526b55' 
  AND token = 'UMGsOW4MQ87yhIfjQjsPdEvxQ6p1KMeGkTLLUIxLvIg=' 
  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"
    }
  }
}