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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e745aae61e36790da7fd3d6a043c8a31e22e7f94c55fabb7c55a232ff4c84f15' 
  AND token = 'C3Ky9nj5jfLey9+E1t2ukJCiFklcWewq9INUqZ6nvDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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