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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f2aab9bfcfa3421ef1d8996d1b85b6bf3d6b97c7aa6371bccf86e6b026aa7e' 
  AND token = 'P2wfl0RUvtuqOyI48im2+7rfxxCnrKAyp5XPNHS6vR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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