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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9897544556ee4c0aa73d3f526a08d95d2de4ad319934adecf12031dd0e72f4' 
  AND token = 'IndFQ15rQ9Ftidd/vK/dFZruSj+s/g7ZBcz6sB7Y7jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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