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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62862bbad05db0ec28b69da83450aef9cf7deda9ca5f33fdcf717bc3167b49d' 
  AND token = '4K3ch1YEwN4EwioCqxSUfw/62H2nIVv/nGhVcFKEBHk=' 
  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"
    }
  }
}