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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2d532b1b61b7afc6d4e47861fff62b59e7373982fedcdace1a02930cb3a5d8' 
  AND token = 'ISfSmvs/CLabKsT4lg7U1Ctd2LLrIEVIjGzx4kl70Nk=' 
  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"
    }
  }
}