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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc0e2b585b5e8078d8f0f096b979d0193ffeb6f4c94f481ad1e1d07e8159473' 
  AND token = 'wIT6jNnsxw50mIj02iZoLFICMS+AMGV6jPc4XxboUQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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