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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91f196028ee5ed8f160e9bf67a49cd2faba3cd7f3b3f327a79329290c5b4998' 
  AND token = 'SsMO9KxpiYnppql0Sf85F5in8fem7GL6ZtAB29chBkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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