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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc5dd184bc2261f4cc0f52db987e66ad0b7d23f646f362a9e3b8379b249674c' 
  AND token = 'AJPpQfaHc8SnZjkJPfsW8TWL0gYAEddLQbrM3FZ8SCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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