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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e09fdb68c312f09652fe36b480c8c91a02b7d674a61d96101c2cb4b2470528' 
  AND token = 'l3inT39icJC3s8CbdaxNUQQC3cCSFhacjbLVr0j5qu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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