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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437bf88e44db50500e7638a0ef6fa7a188c40390e019400d09bb5f85e00eb74e' 
  AND token = 'Q+rI73iRHhtjRFJhTp1+jnu9Un641hjNpJUJSVgI9N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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