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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555d26b87a7621ca096eb3af72312081fb1981d474b423b5648b5ff3a1a9ed08' 
  AND token = 'hItYtvFPcKaHeF5OR7Jeo07Wt5dgAQ8GXjLrAYbucVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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