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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd509d352561925e13d97b99ab4abf77e19287d5ef45cc4102c0191ca0d201887' 
  AND token = 'RIH8nDR8mNXp9+RWjwNrYk5YGdr0zDnCbsvtGsLUS8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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