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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0022c1c931075d6108aa41f056f9681d8def4b9543caf2f26abd625f296da4' 
  AND token = 'E/EMS17kKZHvhz1i6uZO9RqMZRG9bhwhyM5AhDIzvpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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