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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e33f601c796bfe9ffe0d2625a349cf95165436a4dcf0ae5e50c37b4d1636fc' 
  AND token = '/4HL+7pNA7tF1u09crKs+Su3XO6NqHObvwvEJcZA2f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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