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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6657cb784dce0be0a0cc2e5919f1f05eb938b80860f4a4e283e58c55ac88d072' 
  AND token = '/qo9ON0IFLKeVYhCLQvF2+qCL4BW8fJETfjIVbTXkWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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