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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22f556a5b63e15c76ac47a7953893d8f05ebc8d27b96debcec2da814c257de82' 
  AND token = 'GBqUnAGj3YA2hRRzN5CcxrCPXCe+DXBe6eIXtj3N+zY=' 
  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"
    }
  }
}