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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942779b66bcf87fca73ac17401dc697d3717f95c51448d6ea4b547daaed621db' 
  AND token = 'Pd05b03WhiG5/8O7iIwWFvzd6JzkolYno881SUQwITw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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