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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a86fac6d5f207dafb104af0c213c07329d41711b485fb21e2fd92682c42548' 
  AND token = '2AvZL5+k+KK1qle51Hd+CO7Pv/AJ7IMHQDxXxK3f95U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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