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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31c24b2492e7bc56899b901a043b769a1c3f081c0f730908344c4873bc9fe6a' 
  AND token = 'qYxOZXdipyKpG6m4AdORyD13onh2Tk8Jc7Df3A61LDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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